CN116685014B - Dimming control circuit and electronic equipment - Google Patents
Dimming control circuit and electronic equipment Download PDFInfo
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- CN116685014B CN116685014B CN202310974670.2A CN202310974670A CN116685014B CN 116685014 B CN116685014 B CN 116685014B CN 202310974670 A CN202310974670 A CN 202310974670A CN 116685014 B CN116685014 B CN 116685014B
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- 239000003990 capacitor Substances 0.000 claims description 52
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- 230000033228 biological regulation Effects 0.000 claims description 8
- 239000011324 bead Substances 0.000 description 11
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The application relates to the technical field of electronics, and discloses a dimming control circuit and electronic equipment, wherein the dimming control circuit comprises: a control bus 1; the voltage acquisition module 2 comprises an input end and an output end, the input end of the voltage acquisition module 2 is electrically connected with the control bus 1, and the voltage acquisition module 2 is used for acquiring the voltage value of a bypass circuit which is arranged in parallel with the voltage acquisition module 2; a dimming signal module 3 for outputting a dimming signal; the micro control unit MCU processor 4 is electrically connected with the output end of the voltage acquisition module 2 and is in communication connection with the control bus 1; the MCU processor 4 is configured to determine an adjustment control signal according to the received voltage value of the bypass circuit and the dimming signal, where the adjustment control signal is used to control the bus 1 to adjust the dimming duty cycle. The MCU processor 4 can determine the dimming duty cycle required for the bypass circuit based on the voltage value of the bypass circuit and the dimming signal, thereby enabling the bypass circuit to be quickly started.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a dimming control circuit and electronic equipment.
Background
In real life, there are electronic devices capable of realizing a brightness adjustment function, so as to meet the requirements of users on illumination with different brightness. In order to realize brightness adjustment of illumination, a dimming control circuit needs to be added in the electronic equipment.
In the related art, a dimming control circuit is generally set based on a dimming depth and/or an output current ripple requirement. When small brightness is not required to be regulated, the output current of the control bus can quickly reach the voltage of the lamp beads, so that the lamp is quickly started; however, when the small brightness is required, the output current is smaller based on the dimming depth and/or the output current ripple requirement, so that the lamp bead voltage cannot meet the starting requirement for a long time, and the starting waiting time of the small brightness is longer.
Disclosure of Invention
In order to solve the problems, the application provides a dimming control circuit and an electronic device, so as to solve the problem of long starting waiting time of small brightness in the prior art.
The present application provides a dimming control circuit, comprising:
a control bus;
the voltage acquisition module comprises an input end and an output end, the input end of the voltage acquisition module is electrically connected with the control bus, and the voltage acquisition module is used for acquiring a voltage value of a bypass circuit which is arranged in parallel with the voltage acquisition module;
the dimming signal module is used for outputting a dimming signal;
the MCU processor is electrically connected with the output end of the voltage acquisition module and is in communication connection with the control bus; the MCU processor is used for determining an adjusting control signal according to the received voltage value of the bypass circuit and the dimming signal, and the adjusting control signal is used for controlling the bus to adjust the dimming duty ratio;
the voltage acquisition module at least comprises a capacitor and two resistors; the adjustment control signals include a first adjustment control signal for controlling the bus to increase the dimming duty cycle to a first preset value for indicating the dimming duty cycle required to start the bypass circuit, and a second adjustment control signal for controlling the bus to decrease the dimming duty cycle to a second preset value for indicating the dimming duty cycle required to maintain operation of the bypass circuit.
The voltage acquisition module can rapidly acquire the real-time voltage value of the bypass circuit (which can contain lamp beads) connected in parallel with the voltage acquisition module, and the voltage value is transmitted to the MCU processor; after receiving the dimming signal, the MCU processor compares the dimming signal with the voltage value, and judges whether the current voltage value reaches the actual requirement of the bypass circuit (which can be understood as the voltage required by the lighting of the lamp beads), so that the adjustment control signal is determined, and the control bus outputs the adjusted dimming duty ratio according to the adjustment control signal. Based on the above, the voltage value on the bypass circuit can quickly meet the actual requirement of starting the bypass circuit and restore to the actual requirement of maintaining the operation of the bypass circuit.
In an alternative embodiment, the voltage acquisition module includes: a polar capacitance located on the first leg; the electrodeless capacitor is connected with the first resistor in series, the second resistor is connected with the electrodeless capacitor in parallel, and one end of the second resistor is positioned between the electrodeless capacitor and the first resistor; wherein the first branch and the second branch are connected in parallel.
In an alternative embodiment, the control bus and the MCU processor are in communication isolated, and the voltage acquisition module includes: a diode, a first capacitor, a second capacitor, a third resistor and a fourth resistor; the first capacitor, the second capacitor and the third resistor are connected in parallel in pairs; the diode, the fourth resistor and the third resistor are sequentially connected in series, one end of the first capacitor is arranged between the diode and the fourth resistor, and one end of the second capacitor is arranged between the third resistor and the fourth resistor.
In an alternative embodiment, an isolation optocoupler is arranged between the control bus and the MCU processor, and the isolation optocoupler is used for realizing isolation communication between the control bus and the MCU processor.
In an alternative embodiment, the control bus includes an isolation controller.
Under the condition of communication isolation between the control bus and the MCU processor, an isolation optocoupler is required to be arranged to realize isolation communication, a specific implementation mode of the voltage acquisition module is provided, and the voltage value of the bypass circuit is acquired through a plurality of electronic components.
In an alternative embodiment, the control bus and the MCU processor are not isolated from communication, and the voltage acquisition module includes: the fifth resistor, the sixth resistor, the third capacitor and the first zener diode are arranged on the third branch, the fifth resistor is respectively connected with the sixth resistor, the third capacitor and the first zener diode in series, and the sixth resistor, the third capacitor and the first zener diode are arranged in parallel in pairs; the seventh resistor, the eighth resistor, the fourth capacitor and the second zener diode are arranged on the fourth branch, the seventh resistor is respectively connected with the eighth resistor, the fourth capacitor and the second zener diode in series, and the eighth resistor, the fourth capacitor and the second zener diode are arranged in parallel in pairs; the third branch is used for collecting the positive voltage value of the bypass circuit and transmitting the positive voltage value to the MCU processor, and the fourth branch is used for collecting the negative voltage value of the bypass circuit and transmitting the negative voltage value to the MCU processor.
In an alternative embodiment, the control bus includes a non-isolated controller.
Under the condition that communication isolation is not carried out between the control bus and the MCU processor, an isolation optocoupler is not required to be arranged to realize isolation communication, and meanwhile, another specific implementation mode of the voltage acquisition module is provided, and the voltage value of the bypass circuit is acquired through a plurality of electronic components.
In an alternative embodiment, an energy converter is arranged between the control bus and the voltage acquisition module, the energy converter being arranged to supply the same output current to the bypass circuit and the voltage acquisition module, respectively, in dependence on the control bus dimming duty cycle.
The control bus can provide the same output current for the bypass circuit and the voltage acquisition module through the energy converter, so that the voltage value acquired by the voltage acquisition module is consistent with the real-time voltage value of the bypass circuit, and the judgment precision of the MCU processor is improved.
The application also provides electronic equipment, which comprises the dimming control circuit.
Through dimming control circuit, can make electronic equipment realize illumination regulation function, and can shorten the start-up latency of little luminance greatly to make the quick start of realizing little luminance.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a dimming control circuit according to an embodiment of the present application;
fig. 2 is a circuit diagram of a dimming control circuit according to an embodiment of the present application;
FIG. 3 is a circuit diagram of the voltage acquisition module shown in FIG. 2;
FIG. 4 is a circuit diagram of the voltage acquisition module in the isolated communication case;
FIG. 5 is a circuit diagram of the voltage acquisition module without isolated communication;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Wherein reference numerals are as follows:
1-a control bus; 2-a voltage acquisition module; a 3-dimming signal module; 4-MCU processor.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
Currently, for the realization of the brightness adjusting function, a constant current strip dimming circuit may be used. Under the condition of no dimming, the output current charges the capacitor faster, and the voltage required by the lamp beads can be quickly reached to start the lamp beads; after dimming is entered, the output current will decrease so that the bead brightness decreases. When the alternating current (Alternating Current, AC) is powered off and then is cold started again, the voltage cannot reach the voltage required by the lamp beads quickly due to the reduction of the charging current, so that the starting time of the lamp beads with small brightness is long.
In the embodiment of the application, the voltage acquisition module can realize the real-time voltage value of the bypass circuit (which can be understood as a circuit containing lamp beads) and feed the voltage value back to a Micro-Controller Unit (MCU) processor; then, based on the received voltage value of the bypass circuit and the acquired dimming signal, the MCU processor can judge whether the current voltage value of the bypass circuit reaches the required voltage, and based on the voltage value, the MCU processor determines the adjusting control signal so as to enable the control bus to output the adjusted dimming duty ratio according to the adjusting control signal, and further enable the voltage value on the bypass circuit to rapidly meet the actual requirement. The control bus may also be referred to herein as control IC (integrated circuit).
As shown in fig. 1, in this embodiment, there is provided a dimming control circuit, including:
a control bus 1;
the voltage acquisition module 2 comprises an input end and an output end, the input end of the voltage acquisition module 2 is electrically connected with the control bus 1, and the voltage acquisition module 2 is used for acquiring the voltage value of a bypass circuit which is arranged in parallel with the voltage acquisition module 2;
a dimming signal module 3 for outputting a dimming signal;
the micro control unit MCU processor 4 is electrically connected with the output end of the voltage acquisition module 2 and is in communication connection with the control bus 1; the MCU processor 4 is used for determining an adjusting control signal according to the received voltage value of the bypass circuit and the dimming signal, and the adjusting control signal is used for controlling the bus 1 to adjust the dimming duty ratio;
the voltage acquisition module 2 at least comprises a capacitor and two resistors; the adjustment control signals include a first adjustment control signal for controlling the bus 1 to increase the dimming duty cycle to a first preset value for indicating the dimming duty cycle required to start the bypass circuit, and a second adjustment control signal for controlling the bus 1 to decrease the dimming duty cycle to a second preset value for indicating the dimming duty cycle required to maintain the bypass circuit to operate.
Illustratively, the voltage acquisition module 2 is connected in parallel with the bypass circuit, and the control bus 1 provides the same output current to the voltage acquisition module 2 and the bypass circuit through the energy converter respectively, so that the voltage values of the voltage acquisition module 2 and the bypass circuit at the same moment are the same. Based on the above, the voltage value acquired by the voltage acquisition module 2 is the real-time voltage value of the bypass circuit.
Then, the voltage acquisition module 2 feeds back the acquired voltage value to the MCU processor 4; meanwhile, the dimming signal module 3 provides a dimming signal to the MCU processor 4 according to a user's demand. The MCU processor 4 compares the voltage value with the dimming signal to determine an adjustment control signal and sends the adjustment control signal to the control bus 1, and the control bus 1 adjusts the dimming duty cycle to adjust the output current provided to the voltage acquisition module 2 and the bypass circuit.
In some embodiments, the dimming signal includes, but is not limited to, at least one of the following information: the desired voltage of the bypass circuit, the desired current of the bypass circuit, the desired dimming duty cycle of the bypass circuit. The desired voltage is understood to mean, among other things, the voltage value at which the bypass circuit is started and/or the voltage value at which it is operated, the desired current and the dimming duty cycle being similar. Illustratively, the dimming signal includes an expected voltage of the bypass circuit, and after the MCU processor 4 obtains the dimming signal, the expected voltage may be compared with a real-time voltage value transmitted by the voltage acquisition module 2 to determine whether the current voltage value of the bypass circuit reaches the expected voltage, so as to determine an adjustment control signal sent to the control bus 1. It should be understood that the sending time of the dimming signal and the time when the voltage acquisition module 2 transmits the voltage value of the bypass circuit may be the same time or different times, which is not limited by the present application.
For example, after comparing, the MCU processor 4 determines that the real-time voltage value of the bypass circuit is smaller than the desired voltage, and then the MCU processor 4 may determine an adjustment control signal for increasing the dimming duty cycle to a preset value (the preset value may enable the voltage of the bypass circuit to rise to the voltage for starting the bypass circuit, that is, the first preset value), and after receiving the adjustment control signal, the control bus 1 increases the dimming duty cycle to the preset value to output a larger output current, so that the voltage value of the bypass circuit quickly reaches the desired voltage. Then, the voltage acquisition module 2 acquires the real-time voltage value of the bypass circuit at this moment again and feeds the real-time voltage value back to the MCU processor 4, and if the MCU processor 4 compares and judges that the real-time voltage value has reached the desired voltage, the MCU processor 4 may determine a regulation control signal for reducing the dimming duty cycle to a preset value (the preset value may enable the voltage of the bypass circuit to be reduced to a voltage for maintaining the operation of the bypass circuit, that is, the aforementioned second preset value), and after receiving the regulation control signal, the control bus 1 reduces the dimming duty cycle to output a smaller output current, so that the bypass circuit maintains the operation.
It is understood that the adjustment control signal includes: a first adjustment control signal and a second adjustment control signal. The first adjusting control signal is used for controlling the bus 1 to increase the dimming duty ratio to a first preset value, wherein the first preset value is used for indicating the dimming duty ratio required by starting the bypass circuit; the second adjustment control signal is used for controlling the bus 1 to reduce the dimming duty cycle to a second preset value, and the second preset value is used for indicating the dimming duty cycle required for maintaining the operation of the bypass circuit.
Referring to fig. 2, an exemplary dimming control circuit provided by the present application at least includes a constant current topology, an MCU processor, dim signal acquisition, output voltage acquisition, a magnetic device, and optionally an optocoupler. The control bus 1 may be implemented as a constant current control IC, the bypass circuit may be implemented as a circuit including CE1, the dimming signal module 3 may be implemented as a Dim signal module, and the circuit diagram shown in fig. 2 may be understood as a constant current strip dimming line.
Specifically, when dimming is not performed, the CE1 is charged faster by the output current provided by the constant current control IC, and the voltage of the lamp beads can be reached faster, so that the LED is lighted; when the brightness needs to be adjusted to be small, the charging current of the CE1 becomes small, and the electrolytic voltage cannot reach the voltage required by the LEDs quickly and cannot be lighted quickly. Based on this, the application adds a voltage acquisition module 2 in the line to obtain the real-time voltage value of CE 1. If the MCU processor 4 processes only the Dim signal sent by the Dim signal module, the corresponding dimming duty cycle is very small, so that the corresponding output current is smaller, and the charging time for the CE1 is too long. In the application, the MCU processor 4 processes the Dim signal and the obtained voltage value of the CE1 at the same time, when the voltage requirement of the CE1 is not met, the MCU processor 4 can increase the dimming duty ratio through the constant current control IC to increase the output current, so that the CE1 can quickly reach the voltage for lighting the LED, and the aim of quick starting in a small brightness state is fulfilled.
In some embodiments, the voltage acquisition module 2 has a variety of implementations. In the present application, the voltage acquisition module 2 includes at least one capacitor and two resistors.
Referring to fig. 3, the present application provides an implementation manner of the voltage acquisition module 2, which specifically includes:
a polar capacitance (i.e., CE 2) located on the first leg;
the electrodeless capacitor (namely C4), the first resistor (namely R7) and the second resistor (namely R9) are arranged on the second branch, the electrodeless capacitor is connected with the first resistor in series, the second resistor is connected with the electrodeless capacitor in parallel, and one end of the second resistor is arranged between the electrodeless capacitor and the first resistor;
wherein the first branch and the second branch are connected in parallel.
It can be considered that, in conjunction with fig. 2 and 3, the electronic components CE2, C4, R7, R9 constitute the voltage acquisition module 2, so as to obtain the real-time voltage value of CE1 in the bypass circuit. The energy converter is arranged between the constant current control IC and the voltage acquisition module 2, so that the same output current is provided for the CE1 and the CE 2. Alternatively, the energy converter may be implemented as an arbitrary topology.
In some embodiments, communication isolation is performed between the control bus 1 and the MCU processor 4. Referring to fig. 4, an isolated optocoupler (i.e., U1) is disposed between the control bus 1 and the MCU processor 4, and the U1 is used to implement isolated communication between the two. Optionally, the control bus 1 comprises an isolation controller, i.e. the control bus 1 implements an adjustment of the dimming duty cycle by means of the isolation controller. And it should be appreciated that a constant current isolation topology may be implemented between the isolation controller and the voltage acquisition module.
In this case, the voltage acquisition may be achieved by windings. Illustratively, the present application provides an implementation of the voltage acquisition module 2, specifically comprising:
a diode (i.e., D3), a first capacitance (i.e., C1), a second capacitance (i.e., C2), a third resistance (i.e., R6), and a fourth resistance (i.e., R5);
the first capacitor, the second capacitor and the third resistor are connected in parallel in pairs; the diode, the fourth resistor and the third resistor are sequentially connected in series, one end of the first capacitor is arranged between the diode and the fourth resistor, and one end of the second capacitor is arranged between the third resistor and the fourth resistor.
Based on the circuit diagram shown in fig. 4, the voltage acquisition module 2 composed of the electronic components D3, C1, R5, C2, R6 transmits the acquired voltage value to the MCU processor 4, the Dim signal has reached the dimming point, and the MCU processor 4 processes the Dim signal and the voltage value simultaneously. When the output electrolysis CE1 does not meet the required voltage requirement, the MCU processor 4 realizes isolation transmission of a dimming control signal through the U1, so that the dimming duty ratio is increased, the output current of the isolation controller is increased, the CE1 can quickly reach the voltage of the LED lamp, the LED lamp is lightened, and the aim of quick starting is fulfilled under the state of small brightness.
In other embodiments, no communication isolation is performed between the control bus 1 and the MCU processor 4. Referring to fig. 5, there will be no longer a need to provide an isolating optocoupler between the control bus 1 and the MCU processor 4. Optionally, the control bus 1 comprises a non-isolated controller, i.e. the control bus 1 implements an adjustment of the dimming duty cycle by means of the non-isolated controller. And it should be appreciated that a constant current non-isolated topology may be implemented between the non-isolated controller and the voltage acquisition module.
In this case, the windings may be omitted to directly collect the voltage. Illustratively, the present application provides an implementation of the voltage acquisition module 2, specifically comprising:
the fifth resistor (R51), the sixth resistor (R52), the third capacitor (C37) and the first zener diode (ZD 7) are respectively connected in series with the sixth resistor, the third capacitor and the first zener diode in parallel;
the seventh resistor (R67), the eighth resistor (R56), the fourth capacitor (C25) and the second zener diode (ZD 8) are respectively connected in series with the eighth resistor, the fourth capacitor and the second zener diode in parallel, and the eighth resistor, the fourth capacitor and the second zener diode are arranged in pairs;
the third branch is used for collecting the positive voltage value of the bypass circuit and transmitting the positive voltage value to the MCU processor 4, and the fourth branch is used for collecting the negative voltage value of the bypass circuit and transmitting the negative voltage value to the MCU processor 4.
In some embodiments, the third branch and the fourth branch in series may be implemented as: the fifth resistor, the sixth resistor, the third capacitor, the first zener diode, the eighth resistor, the fourth capacitor and the second zener diode are sequentially connected in series, the sixth resistor, the third capacitor, the first zener diode, the eighth resistor, the fourth capacitor and the second zener diode are connected in parallel in pairs, and the fifth resistor and the seventh resistor are connected in parallel.
Based on the circuit diagram shown in fig. 5, the third branch composed of the electronic components R51, R52, C37, ZD7 can also be understood as a positive (or output positive side) voltage acquisition line, and the fourth branch composed of the electronic components R67, R56, C25, ZD8 can also be understood as a negative (or output negative side) voltage acquisition line. The third and fourth branch then pass the two acquired voltage values to the MCU processor 4. At this time, the Dim signal has reached the dimming point, and the MCU processor 4 processes the Dim signal and the voltage value simultaneously. When the output electrolysis CE1 does not meet the required voltage requirement, the MCU processor 4 increases the dimming duty ratio, so that the output current of the non-isolated controller is increased, the CE1 can quickly reach the voltage of the LED lamp, the LED lamp can be lightened, and the aim of quick starting in a small brightness state is fulfilled.
In summary, the application provides a dimming control circuit, which can quickly obtain a real-time voltage value of a bypass circuit connected in parallel with the dimming control circuit through a voltage acquisition module 2, and transmit the voltage value to an MCU processor 4; after receiving the dimming signal, the MCU processor 4 compares the dimming signal with the voltage value, and determines whether the current voltage value reaches the actual requirement of the bypass circuit, thereby determining the adjustment control signal, so that the control bus 1 outputs the adjusted dimming duty cycle according to the adjustment control signal. Based on the above, the voltage value on the bypass circuit can be enabled to meet the actual requirement rapidly.
Optionally, under the condition of communication isolation between the control bus 1 and the MCU processor 4, an isolation optocoupler can be arranged to realize isolation communication, and meanwhile, the application provides a specific implementation mode of the voltage acquisition module 2; in the case that communication isolation is not performed between the control bus 1 and the MCU processor 4, an isolation optocoupler is not required to be provided to implement isolation communication, and meanwhile, the application provides another specific implementation manner of the voltage acquisition module 2, and the two implementation manners can refer to the foregoing.
Referring to fig. 6, the present application also provides an electronic device including the dimming control circuit as described above. The electronic equipment can realize the illumination adjusting function through the dimming control circuit, and the starting waiting time of the small brightness can be greatly shortened, so that the quick starting of the small brightness is realized.
It will be apparent that the embodiments of the present application have been described above in connection with the accompanying drawings, but that various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the application, such modifications and variations falling within the scope defined by the appended claims.
Claims (7)
1. A dimming control circuit, the dimming control circuit comprising:
a control bus (1);
the voltage acquisition module (2) comprises an input end and an output end, wherein the input end of the voltage acquisition module (2) is electrically connected with the control bus (1), and the voltage acquisition module (2) is used for acquiring a voltage value of a bypass circuit which is arranged in parallel with the voltage acquisition module (2);
a dimming signal module (3) for outputting a dimming signal;
the micro control unit MCU processor (4) is electrically connected with the output end of the voltage acquisition module (2) and is in communication connection with the control bus (1); the MCU processor (4) is used for determining an adjusting control signal according to the received voltage value of the bypass circuit and the dimming signal, and the adjusting control signal is used for adjusting the dimming duty ratio of the control bus (1);
the voltage acquisition module (2) at least comprises a capacitor and two resistors; the regulation control signals comprise a first regulation control signal and a second regulation control signal, wherein the first regulation control signal is used for the control bus (1) to increase the dimming duty cycle to a first preset value, the first preset value is used for indicating the dimming duty cycle required for starting the bypass circuit, and the second regulation control signal is used for the control bus (1) to reduce the dimming duty cycle to a second preset value, and the second preset value is used for indicating the dimming duty cycle required for maintaining the operation of the bypass circuit;
the voltage acquisition module (2) comprises: a polar capacitance located on the first leg; the electrodeless capacitor is connected in series with the first resistor, the second resistor is connected in parallel with the electrodeless capacitor, one end of the second resistor is positioned between the electrodeless capacitor and the first resistor, and the first branch and the second branch are connected in parallel;
an energy converter is arranged between the control bus (1) and the voltage acquisition module (2), and the energy converter is used for respectively providing the same output current for the bypass circuit and the voltage acquisition module (2) according to the dimming duty ratio output by the control bus (1).
2. Dimming control circuit according to claim 1, characterized in that in case of communication isolation between the control bus (1) and the MCU processor (4), the voltage acquisition module (2) comprises: a diode, a first capacitor, a second capacitor, a third resistor and a fourth resistor;
the first capacitor, the second capacitor and the third resistor are connected in parallel in pairs; the diode, the fourth resistor and the third resistor are sequentially connected in series, one end of the first capacitor is arranged between the diode and the fourth resistor, and one end of the second capacitor is arranged between the third resistor and the fourth resistor.
3. The dimming control circuit of claim 2, wherein,
an isolation optocoupler is arranged between the control bus (1) and the MCU processor (4), and the isolation optocoupler is used for realizing isolation communication between the control bus (1) and the MCU processor (4).
4. The dimming control circuit of claim 2, wherein,
the control bus (1) comprises an isolation controller.
5. Dimming control circuit according to claim 1, characterized in that the voltage acquisition module (2) comprises, without communication isolation between the control bus (1) and the MCU processor (4):
the fifth resistor, the sixth resistor, the third capacitor and the first zener diode are arranged on the third branch, the fifth resistor is respectively connected with the sixth resistor, the third capacitor and the first zener diode in series, and the sixth resistor, the third capacitor and the first zener diode are arranged in parallel in pairs;
the seventh resistor, the eighth resistor, the fourth capacitor and the second zener diode are arranged on the fourth branch, the seventh resistor is respectively connected with the eighth resistor, the fourth capacitor and the second zener diode in series, and the eighth resistor, the fourth capacitor and the second zener diode are arranged in parallel two by two;
the third branch is used for collecting the positive voltage value of the bypass circuit and transmitting the positive voltage value to the MCU processor (4), and the fourth branch is used for collecting the negative voltage value of the bypass circuit and transmitting the negative voltage value to the MCU processor (4).
6. The dimming control circuit of claim 5, wherein,
the control bus (1) comprises a non-isolated controller.
7. An electronic device comprising a dimming control circuit as claimed in any one of claims 1 to 6.
Priority Applications (1)
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| CN116685014B true CN116685014B (en) | 2023-10-20 |
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| CN209982790U (en) * | 2019-05-13 | 2020-01-21 | 广东芯神科技有限公司 | LED intelligent dimming control circuit and terminal |
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| CN217643784U (en) * | 2022-05-31 | 2022-10-21 | 深圳和而泰智能控制股份有限公司 | Brightness adjusting circuit and household appliance |
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| JP5891454B2 (en) * | 2011-04-18 | 2016-03-23 | パナソニックＩｐマネジメント株式会社 | Semiconductor light-emitting element lighting device and lighting fixture using the same |
| EP2797386B1 (en) * | 2013-04-23 | 2018-06-13 | Nxp B.V. | A dimmable LED lighting circuit, a controller therefor and method of controlling a dimmable LED lighting circuit |
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| CN103167676A (en) * | 2011-12-15 | 2013-06-19 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) light adjustment control circuit and LED lamp with light adjustment control circuit |
| CN103533703A (en) * | 2012-06-28 | 2014-01-22 | 三星电机株式会社 | Circuit and method for driving LED light |
| CN203352889U (en) * | 2013-06-28 | 2013-12-18 | 成都芯源系统有限公司 | LED driving device and control circuit thereof |
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| CN212231774U (en) * | 2020-11-30 | 2020-12-25 | 佛山市迅盈电源科技有限公司 | PWM (pulse-width modulation) dimming switch power supply circuit with constant voltage and constant current output functions |
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| CN116685014A (en) | 2023-09-01 |
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